Sweden will 'never go back' to the days of mass immigration after failed asylum seeker launched Friday's truck attack in Stockholm, says the country's shell-shocked PM

The Prime Minister of Sweden has vowed his country will 'never go back' to recent levels of mass immigration after it emerged the terrorist who killed four people in a truck attack was a failed asylum seeker.

Stefan Löfven pledged to change his country's liberal attitude, insisting the massive influx allowed during the 2015 migrant crisis would never happen again.

Rakhmat Akilov, from Uzbekistan, hijacked the lorry and deliberately drove into pedestrians on central Stockholm's main shopping street on Friday afternoon.